Author Topic: Whirlpool Dryer Can't Change Temperature  (Read 2247 times)

Offline TechnicianBrian

  • Technician
  • Member Since: Dec 2007
  • Posts: 390
  • Country: us
    • TechnicianBrian.com
Whirlpool Dryer Can't Change Temperature
« on: April 09, 2008, 07:35:03 PM »
Model # LEP6646AW0, the complaint was the dryer would only heat on the high heat or air dry settings, and not the low heat. Dryers with multiple temperature selections will often use a device called a bias heater to achieve differing temperature outputs. The bias heater is generally part of the operating thermostat (older models the bias heater may be a separate piece attached to the thermostat) and is in essence a small heating coil. When a temperature other than the normal output of the element is selected, the bias heater will warm the thermostat and cause it to open at a lower temperature than it normally would (element heat + bias heater heat). In this way, lower temperatures (as felt by the clothes) can be produced by a single heating element. This particular dryer had the bias heater portion of the operating thermostat fail open, so the only temperatures that it would produce were high heat (the normal output) and air dry (no power to the element). Replaced the thermostat and now it has all three temperature selections again.



Whirlpool Dryer Cycling Thermostat Part # 3387134
« Last Edit: April 09, 2008, 07:37:47 PM by AJ »

Offline JWWebster

  • Technician
  • Member Since: Jan 2008
  • Posts: 8781
  • Country: us
  • SublimeMasterJW
    • Buy me a beer through paypal
    • JW's Sublime Appliance Advice
Re: Whirlpool Dryer Can't Change Temperature
« Reply #1 on: April 10, 2008, 09:03:10 AM »
I have found that the 2 purple wire conections do not show any continuity even when new. So how can you test this part? They aint cheap.
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline TechnicianBrian

  • Technician
  • Member Since: Dec 2007
  • Posts: 390
  • Country: us
    • TechnicianBrian.com
Re: Whirlpool Dryer Can't Change Temperature
« Reply #2 on: April 10, 2008, 12:17:39 PM »
Do a resistance check not a continuity check.  Most handheld meters will not be able to overcome the resistance of the coil (5.6k to 8.4k range per the tech sheet) enough to indicate a closed circuit. If you do a resistance check and read an open or shorted circuit, the bias heater is bad.

 

Video: How to check voltage at cord on a Whirlpool electric dryer.

Started by AJ

Replies: 0
Views: 9172
Last post August 06, 2007, 05:57:19 PM
by AJ
Video: How to take your Whirlpool dryer apart to replace parts & remove lint

Started by AJ

Replies: 0
Views: 21587
Last post August 16, 2007, 06:02:43 PM
by AJ
How to replace Whirlpool Dryer Motor.

Started by AJ

Replies: 2
Views: 8334
Last post January 15, 2009, 08:13:09 PM
by AJ
whirlpool dryer gew9250PW1

Started by rclarkco

Replies: 1
Views: 4451
Last post December 16, 2007, 01:17:43 PM
by Pegi
Whirlpool Dryer - Run, but does not heat.

Started by AJ

Replies: 2
Views: 3557
Last post January 10, 2014, 12:26:55 PM
by fairbank56
whirlpool dryer metal on metal sounds?

Started by amnesty

Replies: 5
Views: 5977
Last post May 16, 2009, 01:10:38 PM
by mr_fixit